报告题目：Exploring the free-floating planet population with gravitational microlensing

报 告 人：Mr. Przemyslaw Mróz (Univ. of Warsaw) Host: Prof. Shude Mao

报告时间：Thursday, November 8, 2018, 02:00pm

报告地点：蒙民伟科技南楼S727

报告摘要：Theories of planet formation predict the existence of a population of free-floating planets that are not gravitationally tethered to any host star. Gravitational microlensing provides a unique tool for studying these objects. The first results of Sumi et al. (2011) claimed that Jupiter-mass free-floating planets are as common as main-sequence stars. However, these results disagree with censuses of substellar objects in young clusters and star-forming regions and with predictions of planet formation theories. I will present new results of the analysis of a ten times larger sample of microlensing events discovered by the OGLE-IV survey during the years 2010-2015, which shed new light on the population of free-floating planets. I will also discuss prospects for detecting free-floating planets with the future missions, like Euclid and WFIRST.